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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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|
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#include "MidiInputDeviceAlsa.h" |
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|
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namespace LinuxSampler { |
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|
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/** |
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* Create Alsa MIDI input device for LinuxSampler. Opens and initializes |
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* Alsa sequencer client and creates one Alsa MIDI input port for |
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* LinuxSampler. The optional argument allows to auto connect to a Alsa |
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* MIDI source (e.g. a software sequencer or a hardware MIDI input |
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* port). |
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* |
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* @param AutoConnectPortID - (optional) Alsa client and port ID of a |
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* MIDI source we should auto connect to |
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* (e.g. "64:0") |
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* @throws MidiInputException if initialization failed |
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*/ |
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MidiInputDeviceAlsa::MidiInputDeviceAlsa(char* AutoConnectPortID) : Thread(true, 1, -1) { |
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if (snd_seq_open(&hAlsaSeq, "default", SND_SEQ_OPEN_INPUT, 0) < 0) { |
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throw MidiInputException("Error opening ALSA sequencer"); |
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} |
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this->hAlsaSeqClient = snd_seq_client_id(hAlsaSeq); |
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snd_seq_set_client_name(hAlsaSeq, "LinuxSampler"); |
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if ((this->hAlsaSeqPort = snd_seq_create_simple_port(hAlsaSeq, "LinuxSampler", |
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SND_SEQ_PORT_CAP_WRITE|SND_SEQ_PORT_CAP_SUBS_WRITE, |
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SND_SEQ_PORT_TYPE_APPLICATION)) < 0) { |
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throw MidiInputException("Error creating sequencer port"); |
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} |
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|
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if (AutoConnectPortID) ConnectToAlsaMidiSource(AutoConnectPortID); |
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} |
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|
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MidiInputDeviceAlsa::~MidiInputDeviceAlsa() { |
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//TODO: close Alsa seq |
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} |
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|
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void MidiInputDeviceAlsa::Listen() { |
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StartThread(); |
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} |
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|
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void MidiInputDeviceAlsa::StopListen() { |
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StopThread(); |
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} |
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|
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/** |
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* Connects this Alsa midi input device with an Alsa MIDI source. |
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* |
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* @param Client - Alsa sequencer client and port ID of a MIDI source |
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* (e.g. "64:0") |
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* @throws MidiInputException if connection cannot be established |
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*/ |
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void MidiInputDeviceAlsa::ConnectToAlsaMidiSource(const char* MidiSource) { |
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snd_seq_addr_t sender, dest; |
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snd_seq_port_subscribe_t* subs; |
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int hExtClient, hExtPort; |
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|
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sscanf(MidiSource, "%d:%d", &hExtClient, &hExtPort); |
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sender.client = (char) hExtClient; |
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sender.port = (char) hExtPort; |
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dest.client = (char) this->hAlsaSeqClient; |
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dest.port = (char) this->hAlsaSeqPort; |
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snd_seq_port_subscribe_alloca(&subs); |
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snd_seq_port_subscribe_set_sender(subs, &sender); |
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snd_seq_port_subscribe_set_dest(subs, &dest); |
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snd_seq_port_subscribe_set_queue(subs, 1); |
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snd_seq_port_subscribe_set_time_update(subs, 1); |
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snd_seq_port_subscribe_set_time_real(subs, 1); |
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if (snd_seq_subscribe_port(this->hAlsaSeq, subs) < 0) |
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throw MidiInputException(String("Unable to connect to Alsa seq client \'") + MidiSource + "\' (" + snd_strerror(errno) + ")"); |
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} |
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|
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int MidiInputDeviceAlsa::Main() { |
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int npfd; |
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struct pollfd* pfd; |
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snd_seq_event_t* ev; |
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|
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npfd = snd_seq_poll_descriptors_count(hAlsaSeq, POLLIN); |
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pfd = (struct pollfd*) alloca(npfd * sizeof(struct pollfd)); |
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snd_seq_poll_descriptors(hAlsaSeq, pfd, npfd, POLLIN); |
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while (true) { |
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if (poll(pfd, npfd, 100000) > 0) { |
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do { |
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snd_seq_event_input(hAlsaSeq, &ev); |
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switch (ev->type) { |
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case SND_SEQ_EVENT_CONTROLLER: |
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DispatchControlChange(ev->data.control.param, ev->data.control.value, ev->data.control.channel); |
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break; |
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|
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case SND_SEQ_EVENT_PITCHBEND: |
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// fprintf(stderr, "Pitchbender event on Channel %2d: %5d \n", |
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// ev->data.control.channel, ev->data.control.value); |
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DispatchPitchbend(ev->data.control.value, ev->data.control.channel); |
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break; |
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|
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case SND_SEQ_EVENT_NOTEON: |
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if (ev->data.note.velocity != 0) { |
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DispatchNoteOn(ev->data.note.note, ev->data.note.velocity, ev->data.control.channel); |
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} |
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else { |
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DispatchNoteOff(ev->data.note.note, 0, ev->data.control.channel); |
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} |
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break; |
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|
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case SND_SEQ_EVENT_NOTEOFF: |
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DispatchNoteOff(ev->data.note.note, ev->data.note.velocity, ev->data.control.channel); |
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break; |
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} |
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snd_seq_free_event(ev); |
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} while (snd_seq_event_input_pending(hAlsaSeq, 0) > 0); |
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} |
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} |
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} |
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|
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} // namespace LinuxSampler |
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